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US 6,686,501 B2Granted
Processes for preparing 3.3-dimethylbutyric acid
AssigneeBayer Aktiengesellschaft
InventorDennis E. Jackman
Life of this patent
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Abstract
A process for preparing 3,3-dimethylbutyric acid includes the steps of reacting trimethylpyruvic acid with a first portion of hydrazine to obtain a ketazine, and treating the ketazine with base and a second portion of hydrazine.
Claims20
A process for preparing 3,3-dimethylbutyric acid comprising the steps of:
- (a) reacting trimethylpyruvic acid with a first portion of hydrazine to obtain a ketazine, and
- (b) treating the ketazine with base and a second portion of hydrazine.
A process for preparing 3,3-dimethylbutyric acid comprising the steps of:
- (a) reacting trimethylpyruvic acid with hydrazine to obtain a ketazine,
- (b) isolating the ketazine, and
- (c) treating the ketazine with hydrazine and base.
A process for preparing 3,3-dimethylbutyric acid comprising the steps of:
- (a) treating a composition comprising water and trimethylpyruvic acid with hydrazine hydrate to obtain ketazine wherein less than one mole of hydrazine hydrate is used per mole of trimethylpyruvic acid, and
- (b) treating the ketazine with hydrazine hydrate and base.
A process for preparing a ketazine comprising the step of reacting trimethylpyruvic acid with hydrazine to obtain the ketazine.
Dependencies are inferred from the claim text.